Weird Problem - Couldnt open applications

After closing CF i couldn't open any applications till i restart PC and sometimes PC hangs and restart it from the case button

Windows XP SP3
Intel Pentium 4 CPU 3.00 GHz (2CPUs)
NVIDIA GeForce 7300SE/7200GS - 6.14.0011.9038
512 RAM
DirectX 9.0c 4.09.0000.0904

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